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Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter. Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in ...
Section 12.4.2 of ASTM A962 states that fasteners 1″ and under shall be coarse thread, and those 1-1/8″ & larger shall be 8 thread pitch series, unless otherwise specified. In your situation, you will need to know the thread pitch of the insert, expansion joints, nuts, etc. prior to ordering the bolts and then specify the matching thread ...
The minimum thread length shall be equal to one-half the nominal screw length plus 1/2″ or 6”, whichever is less. For extremely long lag screws or for specific applications, custom lag screws with extended threads may need to be manufactured. Pointing. There are three kinds of points a lag screw can have.
The lag thread is deeper and sharper than national coarse thread since it is designed to drive into wood and not to be used with a nut. Imported hex lag screws normally originate from Asia, possess a gimlet point, and meet the requirements of ASTM A307 Grade A. Portland Bolt can manufacture lag screws to meet other ASTM specifications or when ...
Our suite of comprehensive technical tools is designed specifically to provide engineers, architects, and the construction industry with a one-stop shop for technical fastener information. At Portland Bolt, we understand your profession’s unique challenges and demands, which, is why we’ve developed a range of tools to streamline your workflows, enhance precision in information gathering ...
All calculations are for Coarse Thread Series (UNC). Grade 2 calculations only cover fasteners 1 ⁄ 4 “-3 ⁄ 4 ” in diameter up to 6″ long; for longer fasteners the torque is reduced significantly. Clamp loads are based on 75% of the minimum proof loads for each grade and size.
Available Thread Classes. Thread dimensions are covered under the ASME B1.1 specification. There are three different thread classes available: 1(A/B), 2(A/B), and 3(A/B). As the thread class increases the tolerances become tighter (more precise). The A and B following the class designate whether the threads are external (A) or internal (B).
Bolts that are longer than 6″ have a thread length of twice the diameter plus 1/2″. For example, a 1/2 x 6 hex bolt will have 1-1/4″ of thread, whereas a 1/2 x 6-1/2 hex bolt will have 1-1/2″ thread. In our experience, most “off the shelf bolts” that are longer than 12″ have 6″ of thread. Structural Bolts
Heavy hex structural bolts are designed for steel-to-steel structural connections. Consequently, they are typically very short. Unless otherwise specified, F3125 structural bolts will have a Unified National Coarse thread pitch. The F3125 Grades A325 and A490 specifications are not intended for general applications, including anchor bolts.
Currently, the American Society of Mechanical Engineers (ASME) specification B 1.1 does not define a “standard” Unified National Coarse (UNC) thread pitch for 1-5/8” diameter bolts (or 1-7/8” for that matter). The “pseudo standard” coarse thread that is often used in the industry is 5-1/2 threads per inch.